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Communication Dans Un Congrès Année : 2017

MMS Observations of Harmonic Electromagnetic Cyclotron Waves

M. Usanova
  • Fonction : Auteur
N. Ahmadi
R. Ergun
K. J. Trattner
  • Fonction : Auteur
S. A. Fuselier
R. B. Torbert
  • Fonction : Auteur
B. Mauk
  • Fonction : Auteur
Olivier Le Contel
B. L. Giles
  • Fonction : Auteur
C. T. Russell
  • Fonction : Auteur
J. L. Burch
  • Fonction : Auteur
R. J. Strangeway
  • Fonction : Auteur

Résumé

Harmonically related electromagnetic ion cyclotron waves with the fundamental frequency near the O cyclotron frequency were observed by the four MMS spacecraft on May 20, 2016. The wave activity was detected by the spacecraft on their inbound passage through the Earth's morning magnetosphere during generally quiet geomagnetic conditions but enhanced solar wind dynamic pressure. It was also associated with an enhancement of energetic H and O ions. The waves are seen in both magnetic and electric fields, formed by over ten higher order harmonics, most pronounced in the electric field. The wave activity lasted for about an hour with some wave packets giving rise to short-lived structures extending from Hz to kHz range. These observations are particularly interesting since they suggest cross-frequency coupling between the lower and higher frequency modes. Further work will focus on examining the nature and role of these waves in the energetic particle dynamics from a theoretical perspective.
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Dates et versions

hal-02796703 , version 1 (05-06-2020)

Identifiants

  • HAL Id : hal-02796703 , version 1

Citer

M. Usanova, N. Ahmadi, R. Ergun, K. J. Trattner, S. A. Fuselier, et al.. MMS Observations of Harmonic Electromagnetic Cyclotron Waves. AGU Fall Meeting, Dec 2017, New Orleans, Louisiane, United States. ⟨hal-02796703⟩
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